16401904578 has 24 divisors (see below), whose sum is σ = 37082567808. Its totient is φ = 5229592632.

The previous prime is 16401904577. The next prime is 16401904609. The reversal of 16401904578 is 87540910461.

16401904578 is a `hidden beast` number, since 1 + 6 + 4 + 0 + 190 + 457 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (16401904577) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19808650 + ... + 19809477.

It is an arithmetic number, because the mean of its divisors is an integer number (1545106992).

Almost surely, 2^16401904578 is an apocalyptic number.

16401904578 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16401904578 is an abundant number, since it is smaller than the sum of its proper divisors (20680663230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16401904578 is a wasteful number, since it uses less digits than its factorization.

16401904578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39618158 (or 39618155 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 16401904578 in words is "sixteen billion, four hundred one million, nine hundred four thousand, five hundred seventy-eight".